Supporting capital punishment in a narrow set of circumstances does not mean "I want" to kill people or "I'm fired up." CP is a sad situation for very rare circumstances, filled with guilt, and not a job that I would perform. What's sketchy is that hundreds of people sign up for open jobs as executioners.
It is confusing that "I value human life" US adults morally tolerate the "I'm not ready to be a parent" reason to dispatch millions of innocent unborn babies. At the same time, some of these people claim capital punishment is intolerable in all circumstances.
I was surprised that 40% of people surveyed in this study would save their pet over a stranger if both were in front of a bus and only one could be saved. I'm one of the 60% that would save the random stranger over my Golden Retriever. However, I would save my Golden if the stranger was that murderous lady.
Is there a price on human life? According to the 4000-year-old Code of Hammurabi, the unborn life was worth ten shekels, and adult life was an eye for an eye. Nowadays, the US government values a statistical life at $10 Million. The cost of incarcerating a criminal for 40 years is ~$1 Million. Add CP, and it's triple that cost. CP is not cost-effective, nor should it be for most situations. To an earlier practical point, for a narrow set of situations with simply unquestionable guilt convictions, the CP process could be streamlined and cost-effective.
After exploring this and that, by all calculations for morality and the price of human life, the MoD for Briner trade was an objectively bad deal.